# CVE-2023-49279: Umbraco CMS vulnerable to stored XSS via SVG File Upload

> An attacker with backoffice access can upload malicious SVG files to execute scripts in other users' browsers, potentially leading to account takeover.

- **Severity:** Low 3.7 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 12 Dec 2023
- **Updated:** 28 Aug 2024
- **Also known as:** GHSA-6xmx-85x3-4cv2

## What is CVE-2023-49279?

CVE-2023-49279 is a low-severity cross-site scripting vulnerability in Umbraco Umbraco Cms, published on 12 Dec 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Umbraco is an ASP.NET content management system (CMS). Starting in version 7.0.0 and prior to versions 7.15.11, 8.18.9, 10.7.0, 11.5.0, and 12.2.0, a user with access to the backoffice can upload SVG files that include scripts. If the user can trick another user to load the media directly in a browser, the scripts can be executed. Versions 7.15.11, 8.18.9, 10.7.0, 11.5.0, and 12.2.0 contain a patch for this issue. Some workarounds are available. Implement the server side file validation or serve all media from an different host (e.g cdn) than where Umbraco is hosted.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2023-49279?

10 open source packages ship an affected version, including Umbraco.CMS. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `Umbraco.CMS` | NuGet | From 11.0.0 | 11.5.0 |
| `Umbraco.CMS` | NuGet | From 11.0.0 | 11.5.0 |
| `Umbraco.CMS` | NuGet | From 12.0.0 | 12.2.0 |
| `Umbraco.CMS` | NuGet | From 12.0.0 | 12.2.0 |
| `Umbraco.CMS` | NuGet | From 7.0.0 | 7.15.11 |
| `Umbraco.CMS` | NuGet | From 7.0.0 | 7.15.11 |
| `Umbraco.CMS` | NuGet | From 8.0.0 | 8.18.9 |
| `Umbraco.CMS` | NuGet | From 8.0.0 | 8.18.9 |
| `Umbraco.CMS` | NuGet | From 9.0.0 | 10.7.0 |
| `Umbraco.CMS` | NuGet | From 9.0.0 | 10.7.0 |

Products: Umbraco Umbraco Cms.

## How do I fix CVE-2023-49279?

Upgrade Umbraco.CMS to a fixed version for your release line: 11.5.0, 12.2.0, 7.15.11 or 8.18.9.

## Is CVE-2023-49279 being exploited?

There is no known exploitation of CVE-2023-49279 in the wild and no public exploit code.

## Other vulnerabilities in Umbraco Umbraco Cms

- [CVE-2025-67288](https://insights.sbomify.com/CVE-2025-67288/): Umbraco CMS has an arbitrary file upload vulnerability (critical 10.0)
- [CVE-2014-10074](https://insights.sbomify.com/CVE-2014-10074/): File upload in n/a (critical 9.8)
- [CVE-2012-1301](https://insights.sbomify.com/CVE-2012-1301/): Server-side request forgery in n/a (critical 9.8)
- [CVE-2012-10054](https://insights.sbomify.com/CVE-2012-10054/): Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE (critical 9.3)
- [CVE-2025-32017](https://insights.sbomify.com/CVE-2025-32017/): Umbraco has a Management API Vulnerability to Path Traversal With Authenticated Users (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-49279 and fix it if it is affected.

What it is: CVE-2023-49279 is a low-severity cross-site scripting vulnerability in Umbraco Umbraco Cms, published on 12 Dec 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2023-49279 in the wild and no public exploit code.

Affected packages and fixed versions:
- Umbraco.CMS (NuGet): affected from 11.0.0; fixed in 11.5.0
- Umbraco.CMS (NuGet): affected from 11.0.0; fixed in 11.5.0
- Umbraco.CMS (NuGet): affected from 12.0.0; fixed in 12.2.0
- Umbraco.CMS (NuGet): affected from 12.0.0; fixed in 12.2.0
- Umbraco.CMS (NuGet): affected from 7.0.0; fixed in 7.15.11
- Umbraco.CMS (NuGet): affected from 7.0.0; fixed in 7.15.11
- Umbraco.CMS (NuGet): affected from 8.0.0; fixed in 8.18.9
- Umbraco.CMS (NuGet): affected from 8.0.0; fixed in 8.18.9
- Umbraco.CMS (NuGet): affected from 9.0.0; fixed in 10.7.0
- Umbraco.CMS (NuGet): affected from 9.0.0; fixed in 10.7.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-49279/ (Markdown: https://insights.sbomify.com/CVE-2023-49279/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-49279
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-49279
- OSV: https://osv.dev/vulnerability/CVE-2023-49279

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-49279/
Summaries are generated and may contain mistakes; the official description above is the record.